ECU Power Source Circuit

DESCRIPTION

This is the power source for the tire pressure warning ECU.

WIRING DIAGRAM
CAUTION / NOTICE / HINT

NOTICE:

• When replacing the tire pressure warning ECU, read the IDs stored in the old ECU using the Techstream and write them down before removal.
• It is necessary to perform registration of the transmitter IDs into the tire pressure warning ECU after the ECU and/or the tire pressure warning valve and transmitter has been replaced (See page ).


• Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (ECU - BATTERY)

(a) Disconnect the F7 ECU connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
F7-7 (IG) - Body ground	Ignition switch ON	11 to 14 V
	Ignition switch off	Below 1 V

Text in Illustration

*a	Front view of wire harness connector (to Tire Pressure Warning ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

1. CHECK HARNESS AND CONNECTOR (ECU - BODY GROUND)

(a) Disconnect the F7 ECU connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F7-9 (GND) - Body ground	Always	Below 1 Ω

Text in Illustration

*a	Front view of wire harness connector (to Tire Pressure Warning ECU)

OK

REPLACE TIRE PRESSURE WARNING ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR